You have a netbook computer that runs Windows 7. The computer has a single 30-GB partition that has 10 GB of free space. You need to create a system image of the computer by using Windows Backup. You must achieve this goal by using the minimum amount of time.
What should you do first?

A.
Attach an external hard disk.

B.
Attach an external DVD burner.

C.
Convert the local hard disk to a GPT disk.

D.
Create and attach a virtual hard drive (VHD).